Add ContentSettingsProvider Interface.

chrome/browser/content_settings/host_content_settings_map.cc

Index: chrome/browser/content_settings/host_content_settings_map.cc
diff --git a/chrome/browser/content_settings/host_content_settings_map.cc b/chrome/browser/content_settings/host_content_settings_map.cc
index 0345e81991547f921dc933f754c50e5078ca6669..2ca370c15de3ab2780aafe93affd95e1aa8b7dad 100644
--- a/chrome/browser/content_settings/host_content_settings_map.cc
+++ b/chrome/browser/content_settings/host_content_settings_map.cc
@@ -26,6 +26,10 @@
 #include "net/base/net_util.h"
 #include "net/base/static_cookie_policy.h"
 
+using content_settings::DefaultContentSettingsProviderInterface;
+using content_settings::PrefDefaultContentSettingsProvider;
+using content_settings::PolicyDefaultContentSettingsProvider;
+
 namespace {
 
 // The preference keys where resource identifiers are stored for
@@ -88,7 +92,7 @@ ContentSetting ClickToPlayFixup(ContentSettingsType content_type,
   return setting;
 }
 
-typedef linked_ptr<DefaultContentSettingsProvider>
+typedef linked_ptr<DefaultContentSettingsProviderInterface>
     DefaultContentSettingsProviderPtr;
 typedef std::vector<DefaultContentSettingsProviderPtr>::iterator
     provider_iterator;
@@ -114,10 +118,10 @@ HostContentSettingsMap::HostContentSettingsMap(Profile* profile)
   // providers further up.
   default_content_settings_providers_.push_back(
       DefaultContentSettingsProviderPtr(
-          new PrefContentSettingsProvider(profile)));
+          new PrefDefaultContentSettingsProvider(profile)));
   default_content_settings_providers_.push_back(
       DefaultContentSettingsProviderPtr(
-          new PolicyContentSettingsProvider(profile)));
+          new PolicyDefaultContentSettingsProvider(profile)));
 
   PrefService* prefs = profile_->GetPrefs();